National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Partly Cloudy

76°F

24°C

Humidity 50%
Wind Speed NW 5 mph
Barometer 30.10 in (1018.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 24 Aug 2:54 pm CDT
Extended Forecast for

Niantic IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 80. Calm wind.

    High: 80 °F

    Partly Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 58. Light east wind.

    Low: 58 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 82. Southeast wind 3 to 6 mph.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. Southeast wind 3 to 6 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 87. South wind 5 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 1am. Mostly clear, with a low around 63. West wind around 6 mph becoming calm in the evening.

    Low: 63 °F

    Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 85. Light northwest wind increasing to 5 to 9 mph in the morning.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 80. Calm wind.
Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 58. Light east wind.
Tuesday
Patchy fog before 8am. Otherwise, sunny, with a high near 82. Southeast wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 63. Southeast wind 3 to 6 mph.
Wednesday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 87. South wind 5 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
A 30 percent chance of showers before 1am. Mostly clear, with a low around 63. West wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 85. Light northwest wind increasing to 5 to 9 mph in the morning.
Thursday Night
Mostly clear, with a low around 61.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 62.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Niantic IL
 39.85°N 89.17°W (Elev. 600 ft)
Last Update:
3:37 pm CDT Aug 24, 2026
Forecast Valid:
3pm CDT Aug 24, 2026-6pm CDT Aug 30, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation